Prehnite: Mineral information, data and localities.
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Prehnite – WGNHS – UW–Madison
File:Silver-prehnite-copper (Mesoproterozoic, 1.05-1.06 Ga; Quincy Mine, Hancock, Upper Peninsula of Michigan, USA) (16665235963).jpg - Wikimedia Commons
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Prehnite gemstone information
SUMMARY OF STUDIES OF PREHNITE COMPOSITION
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1.3 Prehnite & Epidote Cluster mali 23g Natural Green - Hong Kong
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